A catch-all email mailbox is one that captures all the messages sent to inactive email addresses. For instance, if your address is firstname.lastname@example.org, but someone misspells it and sends an email to email@example.com, it will still be received in the catch-all mailbox that you have configured. Just one mailbox per domain name can have this feature activated and thus you will never miss emails because the other party has an outdated address or has made a spelling error. The downside of having a catch-all mailbox is that you may begin receiving plenty of junk emails, but this problem can be fixed using anti-spam filtering software. It’s also essential to keep in mind that a mailbox with an activated catch-all functionality cannot redirect inbound messages to a third-party email address.